Cite
^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.
MLA
Brewer, S. M., et al. “^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.” Physical Review Letters, vol. 123, no. 3, July 2019, p. 033201. EBSCOhost, https://doi.org/10.1103/PhysRevLett.123.033201.
APA
Brewer, S. M., Chen, J.-S., Hankin, A. M., Clements, E. R., Chou, C. W., Wineland, D. J., Hume, D. B., & Leibrandt, D. R. (2019). ^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}. Physical Review Letters, 123(3), 033201. https://doi.org/10.1103/PhysRevLett.123.033201
Chicago
Brewer, S M, J-S Chen, A M Hankin, E R Clements, C W Chou, D J Wineland, D B Hume, and D R Leibrandt. 2019. “^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.” Physical Review Letters 123 (3): 033201. doi:10.1103/PhysRevLett.123.033201.